feat: migrate embeddings to Candle WASM + remove semantic type inference

Major architectural changes:

1. EMBEDDINGS ENGINE (ONNX → Candle WASM):
   - Replace ONNX Runtime with Rust Candle compiled to WASM
   - Embedded model in WASM binary (no external downloads)
   - Quantized Q8 precision with <50MB memory footprint
   - Zero-download, offline-first operation
   - Same embedding quality (all-MiniLM-L6-v2)

2. REMOVE SEMANTIC TYPE INFERENCE:
   - Delete embeddedKeywordEmbeddings.ts (14MB of pre-computed embeddings)
   - Remove typeAwareQueryPlanner.ts and semanticTypeInference.ts
   - Remove VerbExactMatchSignal (uses keyword embeddings)
   - Update SmartRelationshipExtractor to 3 signals (55%/30%/15% weights)

API CHANGES (requires v7.0.0):
- Removed: inferTypes(), inferNouns(), inferVerbs(), inferIntent()
- Removed: getSemanticTypeInference(), SemanticTypeInference class
- Removed: TypeInference, SemanticTypeInferenceOptions types

Users can still use natural language queries in find() - they just
need to specify type explicitly for type-optimized searches.

PACKAGE SIZE IMPACT:
- Compressed: 90.1 MB → 86.2 MB (-4.3%)
- Uncompressed: 114.4 MB → 100.3 MB (-12%)
- ~448K lines of code removed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -486,18 +486,6 @@ import { getNounTypes, getVerbTypes, getNounTypeMap, getVerbTypeMap } from './ut
 // Export BrainyTypes for complete type management
 import { BrainyTypes, TypeSuggestion, suggestType } from './utils/brainyTypes.js'
 
-// Export Semantic Type Inference - THE ONE unified system (nouns + verbs)
-import {
-  inferTypes,
-  inferNouns,
-  inferVerbs,
-  inferIntent,
-  getSemanticTypeInference,
-  SemanticTypeInference,
-  type TypeInference,
-  type SemanticTypeInferenceOptions
-} from './query/semanticTypeInference.js'
-
 export {
   NounType,
   VerbType,
@@ -507,20 +495,11 @@ export {
   getVerbTypeMap,
   // BrainyTypes - complete type management
   BrainyTypes,
-  suggestType,
-  // Semantic Type Inference - Unified noun + verb inference
-  inferTypes,        // Main function - returns all types (nouns + verbs)
-  inferNouns,        // Convenience - noun types only
-  inferVerbs,        // Convenience - verb types only
-  inferIntent,       // Best for query understanding - returns {nouns, verbs}
-  getSemanticTypeInference,
-  SemanticTypeInference
+  suggestType
 }
 
 export type {
-  TypeSuggestion,
-  TypeInference,
-  SemanticTypeInferenceOptions
+  TypeSuggestion
 }
 
 // Export MCP (Model Control Protocol) components